/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/DenseMatrix.h
Return C = A x B, where B is an 6xN matrix, and A is a 6x6 mass matrix (Mass in upper left 3x3 diagonals, Inertia in lower right 3x3). C = |M 0| * |B0| = |M.B0| |0 I| |B1| |I.B1|
template<int32 T_EB> static [TDenseMatrix](API\Runtime\Chaos\Chaos\TDenseMatrix)< MaxElements > MultiplyAB ( const [FMassMatrix](API\Runtime\Chaos\Chaos\FMassMatrix) & A, const [TDenseMatrix](API\Runtime\Chaos\Chaos\TDenseMatrix)< T_EB > & B )